Akai 4000DS

V. HEAD ADJUSTMENTS
ERASE RECORDING PLAYBACK
HEAD HEAD HEAD • Fig- I I
Since adjustment of the Meads critically affects tape
recorder performance, it is essential that Heads be
carefully adjusted with precision measuring equip¬
ment and suitable recorded tape.
1. H EAD HEIGHT ADJUSTMENTS
(See Figs. 10, II)
1) Erase Head
Adjust height control screws (a), (b) by turning to
left and right so that the upper edge of the tape is
0.15 mm lower than the upper edge of the erase
head core.
2) Recording Head
Adjust the screws (c), (d) by turning to left and
right until the width between the upper edge of
channel 1 head core and upper edge of the tape is
equal.
3) Playback Head
Adjust the screws (f), (g) by turning to left and
right until the width between the upper edge of
channel 1 head core and upper edge of the tape is
equal.
2. HEAD SLANT ADJUSTMENT
(See Figs. 10, 11)
Adjust the screws (Head Height control screw) by
turning to left and right so that each head (Erase,
Recording and Playback Head) contacts the tape
surface at a right angle.
3. HEAD AZIMUTH ALIGNMENT
ADJUSTMENTS (See Figs. 10, II)
1) Playback I lead
Playback an Ampex Alignment lest tape (8,000 Hz
345 ips.) at IVi ips. Adjust screw (h) by turning to
left and right until the various line outputs are
maximum.
2) Recording Head
At recording mode, supply a 15.000 Hz sine wave
at a -16 dli recording level an Audio Frequency
Oscillator to the line input of the 4000DS,and set
the monitor switch to “TAPE” position. Then
adjust screw (e) by turning to left and right until
the various line outputs arc maximum.
4. Repeat adjustments outlined in Items 1-2) to
3, above 2 or 3 times to obtain optimum
adjusted condition.